Quiz - Structure and Reactivity | Structure and Reactivity
Which compound is most acidic?
When comparing the acidity of different molecules, it is actually easier to compare the stability of their respective bases ⇒ less stable base = strongest base ⇒ strongest base = weakest acid
The more electronegative an atom, the stronger the inductive attracting effect and the more stable the base
Electronegativity: F > Cl > Br > I
Which compound is most basic?
Lone pairs of electrons are stabilized by the s character of orbital. The % of s character is 25% in sp3 hybridization, 33% in sp2 and 50% in sp. Therefore, increasing basicity correlates with hybridization as follows: sp < sp2 < sp3
Which compound is an ether?
CH3CH2CH2COH ⇒ aldehyde; CH3CH2CH2COOH ⇒ carboxylic acid; CH3CH2OCH2CH3 ⇒ ether; CH3CH2COCH3 ⇒ ketone
Which of the following compounds is a Lewis Base?
All of the above
A Lewis base is a substance that donates an electron pair: H2O has 2 pairs of electrons on oxygen ⇒ it is a Lewis base
A Lewis acid is a substance that accepts an electron pair: BH3 and AlCl3 are electron-poor species (boron and aluminium need electrons to follow the octet rule) ⇒ BH3 and AlCl3 are Lewis acids
Which of the following cannot react as a nucleophile?
CH3O+H2 is an electrophile: electron-poor species that can form a covalent bond by accepting an electron pair from a nucleophile. Indeed the oxygen atom is positively charged and therefore poor in electrons
How do you call 2 molcules with the same molecular formula but different bonds?
Chemical species with the same molecular formula but that differ in the way the atoms are connected to each other. They are also called structural isomers